Have you ever wanted to open a url from the command line on OS X? Turns out open can do many cool things like that.

open -a ‘google chrome’ ‘http://www.scottcsims.com’

open -a Firefox.app http://www.scottcsims.com

Sometimes a parallel Selenium run might get out of control and you need to close all your browsers, try this one from the command line:

killall firefox

Yes, I know killall is a very old Unix command, but I didn’t know that I could pass it an application name that a OS X has bound to an executable.

killall firefox-bin
orkillall firefox

I like the -a and -e options for open.

Usage: open [-e] [-t] [-f] [-W] [-R] [-n] [-g] [-h] [-b ] [-a ] [filenames] [--args arguments]
Help: Open opens files from a shell.
By default, opens each file using the default application for that file.
If the file is in the form of a URL, the file will be opened as a URL.
Options:
-a Opens with the specified application.
-b Opens with the specified application bundle identifier.
-e Opens with TextEdit.
-t Opens with default text editor.
-f Reads input from standard input and opens with TextEdit.
-F --fresh Launches the app fresh, that is, without restoring windows. Saved persistent state is lost, excluding Untitled documents.
-R, --reveal Selects in the Finder instead of opening.
-W, --wait-apps Blocks until the used applications are closed (even if they were already running).
--args All remaining arguments are passed in argv to the application's main() function instead of opened.
-n, --new Open a new instance of the application even if one is already running.
-j, --hide Launches the app hidden.
-g, --background Does not bring the application to the foreground.
-h, --header Searches header file locations for headers matching the given filenames, and opens them.